Hi,

We have configured High Availability for Pega applications (2 nodes). When a node is disabled on load balancer and Quiesce is performed for disabled node, existing user sessions are seamlessly moved to active node. But when the other disabled node is restarted and enabled it on load balancer, following message is shown to users of sessions that have been seamlessly moved on performing action:

“You have lost the ability to make this change because a change elsewhere has taken precedence over the change you made here.”

Please see attached screenshot.

Though there is no loss of data and on clicking the assignment again user is able to continue with session without any issues, how to avoid/fix showing above message?

Configuration:

Apache Tomcat Webserver

Kemp load balancer

Number of nodes in cluster: 2

SQL Server database

Following settings are done in config.xml:

<env name="initialization/settingsource" value="merged" />

<env name="session/ha/Enabled" value="true"/>

<env name="session/ha/quiesce/customSessionInvalidationMethod" value="configurable-cookie-invalidator"/>

<env name="session/ha/quiesce/cookieToInvalidate" value="cookie-name-configured-in-load-balancer"/>

Any inputs are greatly appreciated.

Thanks,

Murali